Understanding Clonic Tonic Seizure ICD-10 Codes: A Comprehensive Guide

What is Clonic Tonic Seizure ICD 10?

Clonic Tonic Seizure ICD 10 is a medical code used to classify and code seizures in the International Classification of Diseases, 10th Edition (ICD-10). This specific code is used to describe a type of seizure that involves both clonic (rhythmic jerking) and tonic (muscle stiffness) movements. These seizures are also known as tonic-clonic seizures or grand mal seizures.

Code Information

Epilepsy with generalized tonic-clonic seizures alone  MedLink
Epilepsy with generalized tonic-clonic seizures alone MedLink

The ICD-10 code for Clonic Tonic Seizure is G40.1. This code is used by healthcare providers to accurately document and classify these types of seizures for billing and diagnostic purposes.

Diagnostic Related Groups (MS-DRG)

Accuracy of ICD--CM claims-based definitions for epilepsy and
Accuracy of ICD–CM claims-based definitions for epilepsy and

Clonic Tonic Seizure falls under MS-DRG 101 – Seizures with Major Comorbid Conditions. This DRG grouping is used by hospitals to determine reimbursement rates for patients with seizures and related conditions.

Convert to ICD-9 Code

ICD--CM Diagnosis Code G
ICD–CM Diagnosis Code G

In the previous version of the International Classification of Diseases (ICD-9), Clonic Tonic Seizure was classified under code 345.4. This information is important for healthcare providers who may still be using the older coding system.

Code History

The classification of seizures has evolved over time, with changes in the ICD system reflecting advancements in our understanding of these neurological conditions. The specific coding for Clonic Tonic Seizure has been refined and updated to improve accuracy in diagnosis and treatment.

Approximate Synonyms

Clonic Tonic Seizure may also be referred to as generalized tonic-clonic seizure, grand mal seizure, or convulsive seizure. These terms are used interchangeably to describe the same type of seizure activity.

Clinical Information

Clonic Tonic Seizures are a type of generalized seizure that affects both sides of the brain. They typically involve a loss of consciousness and can be accompanied by convulsions and muscle jerking. These seizures can be frightening to witness, but they are usually not life-threatening if managed appropriately.


The exact cause of Clonic Tonic Seizures is not always clear, but they are often associated with epilepsy, a neurological disorder characterized by recurrent seizures. Other potential causes include brain injuries, tumors, infections, or genetic factors.


Symptoms of Clonic Tonic Seizures may vary from person to person, but common signs include sudden loss of consciousness, stiffening of the body, jerking movements, drooling, and confusion after the seizure. Some individuals may experience an aura or warning sign before the seizure occurs.


Diagnosing Clonic Tonic Seizures typically involves a comprehensive medical history, physical examination, and neurological testing. Additional tests such as EEG (electroencephalogram) or imaging studies may be ordered to identify the underlying cause of the seizures.


Treatment for Clonic Tonic Seizures may include medications to control seizures, lifestyle modifications, and seizure management techniques. In some cases, surgery or other interventions may be recommended to reduce seizure activity and improve quality of life for individuals with epilepsy.


Clonic Tonic Seizure ICD 10 is a specific medical code used to classify and document seizures in the ICD-10 system. Understanding the code information, diagnostic related groups, and clinical information related to these seizures is essential for accurate diagnosis and treatment. By raising awareness and providing education about Clonic Tonic Seizures, healthcare providers can better support individuals living with epilepsy and other seizure disorders.


Can Clonic Tonic Seizures be controlled with medication?
Yes, many individuals with Clonic Tonic Seizures can effectively manage their seizures with antiepileptic medications prescribed by their healthcare provider.
Are Clonic Tonic Seizures considered a medical emergency?
In most cases, Clonic Tonic Seizures are not considered life-threatening, but it is important to seek medical attention if seizures last longer than usual or if there are concerns about the individual’s safety during a seizure.
Can Clonic Tonic Seizures be prevented?
While it may not be possible to prevent all seizures

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